Calculating-machine



H. ENDERS. CALCULATING MACH|N E.

APPLICATION FILED DEC. 8.1919- Patented Jan. 4, 1921.

2 SHEETSSHEET I- H. ENDERS.

CALCULATING MACHINE.

APPLICATION FILED DEC. 8, 191 9.

Patented Jan. 4, 1921.

2 SHEETSSHEET 2.

UNITED STATES PATENT OFFICE.

HUGO ENDERS, OF LEHIGHTON, PENNSYLVANIA, ASSIGNOR TO THE LEHIGH CORPO-RATION, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE.

CALCULATING-MACHIN E.

To all whom it may concern: Be it known that I, HUGO ENDERS, a cit zenof the Republic of Germany, and a resident of the town of Lehighton,county of Carbon, State of Pennsylvania, have invented certain new anduseful Improvements in Calculating-Machines, of which the following is aspecification.

zero position.

To the above end, my invention contemplates the provision of a resettingmechanism of simple and reliable construction which may be actuated toreturn all of the digit wheels in the series to zero position by asingle operation of a conveniently located pivoted lever.

The present improvement also provides a very compact mounting andarrangement of the several elements, so that the mechanism will not beliable to get out of order or require frequent repair. I

VV'th the above and other objects in view, the invention consists-in theprovision of an improved resetting mechanism for calculating machines asabove characterized, and in the form, construction, and relatlvearrangement of its several parts as Wlll be hereinafter more fullydescribed, illustrated in the accompanying drawings, and subsequentlyincorporated 1n the sub omed claims.

In the drawings wherein I have illustrated one practical embodiment ofmy invention, and in which similar reference characters designatecorresponding parts throughout the several views,

Figure 1 is a fragmentary perspective view of a' calculating machine ofa wellknown type, which is equipped with the present improvements.

Fig. 2 is an enlarged transverse sectional view.

Fig. 3 is a longitudinal section showing the normal position of thedigit wheel shaft. Fig. 4 is a section on the line 4.4 of Fig. 3,showing the relative positions of the parts after the shaft has beenrotated and the wheels reset in zero position.

Fig. 5 is a fragmentary longitudinal section with the shaft in theposition seen in Fig. 4.

Specification of Letters Patent.

Application filed December 8, 1919.

Patented Jan. 4, 1921.

Serial No. 343,325. I

Fig. 6 is a section taken on the line 6-6 of Fig. 5.

Fig. 7 is a transverse section taken on the line 77 of Fig. 5.

Fig. 8 is a detail perspective view of certain of the parts.

Fig. 9 is a detail section illustrating a slight modification.

Referring in detail to the drawings, 5 designates the case or housingwhich is mounted upon a suitable base and incloses two series of wheelswhich indicate respectively one of the factor numbers in the problem tobe calculated and the product number. It is the purpose of mypresentimprovements to provide an individual resetting means for thesetwo series of wheels whereby they may be instantly reset to zeroposition. It will be understood that the calculating machine which Ihave represented partially in Fig.

digit wheels 8 are loosely mounted for rela-' tive rotation on a shaft9. This shaft atone of its ends is journaled in an elongated bearing 10provided on a transverse frame plate 11. The other end of the shaft 9 ismounted in a sleeve bearing 12 which extends through the end wall of anindented portion 13 of the end wall of the, casing 5 and is suitablyfixed thereto. The outer end portion of this bearing sleeve is housedwithin the tubular portion 13 of the casing wall, the open end of whichmay be closed by the plate 14, which at its edges is countersunk in theface of the casing wall and suitably secured thereto. The outer end ofthe bearing sleeve 12 has a notch or recess therein provided with-thecam face 15 with which the projecting end of a pin 16 fixed in the shaft9 coacts.

Each of the digit wheels 8 is of annular form and the usual cog gear 17is suitably fixed to one side face of each wheel with V which therotation transmitting pinions en'- gage. To the. opposite side face ofthe wheel 8 a metal plate 18 is fixed and loosely surrounds the shaft 9.A stud 19 projects longitudinally of the shaft from the inner face ofthis plate. 0n the shaft 9 are providedthe spaced studs or teeth 20which, in one position of said shaft are adapted to coact with therespective studs 19 of the wheels 8.

Upon the end of the shaft 9, which is mounted in bearing 10, a ratchettoothed pinion 21 is fixed. The teeth of a vertically movable rack 22are engaged with the teeth of this pinion for the purpose of rotatingthe shaft 9 in one direction. The rack 22 and the pinion 21 are disposedwithin a depressed or channeled portion 23 of the frame plate 11, and itwill be noted that the peripheral face of the pinion 21 is ofappreciably greater width than the thickness of the rack 22, so that theshaft 9 may shift axially in its hearings without disengaging the pinionfrom the teeth of the rack.

The rack is yieldingly held in operative engagement with the pinion bymeans of a leaf spring 2 1 which is interposed between the untoothedvertical edge of said rack and the opposed side wall of the channel .23.it will be seen that this spring normally urges the toothed edge of theraclr against the teeth the. pinion 21, out will permit of the upwardmovement of the rack without rotating the pinion. The raclr 22 isretained in the channel 23 by means of a guide plate 25 which is fixedto the frame plate 11 and extends over the lower portion of saidchannel.

The operating lever 26 extends through a slot 2? in the front wall ofthe casing 53 and at its lower end is pivotally mounted as at 28 uponthe frame plate 11. This lever intermediate of its ends is curved as at29 to accommodate the pinion 21 when the lever is moved downwardly inthe slot 27. This curved portion of the lever is provided with alongitudinal slot 30 to receive the pin 81 which is fixed in the upperend of the rack 22. A spring 32 normally urges the lever 26 and the rack22 upwardly, it be ing understood of course, that this spring issufficiently strong to overcome the resistance offered by the action ofthe leaf sprinx Tn the operation of the mechanism above described, itwill be understood that normally, the shaft 9 merely acts as a supportfor the digit wheels which are freely rotatable relative to each otherupon said shaft, lout are held against casual rotating movement by theinterlocking engagement of the cog gears 17 with the transmission gearsor pinions. When it is desired to reset the digit wheels so that thezero on each wheel will appear in the sight openings of the casing, theoperator simply engages the upwardly projecting end of lever 26 with hisfinger and forces the same downwardly in the slot 27 to the lower endthereof. in this movement of the lever, the rack 22 is moved downwardlyand the teeth on this rack engaging the pinion 21 rotate the shaft 9.Initially, or at the start of this rotative movement of the shaft, thepin 16 riding upon the cam surface 15 of the hearing sleeve 12 impartsan axial movement to said shaf so that the teeth or studs 20 on theshaft are moved into contact with the inner faces of the plates 18 onthe wheels 8 and into circumferential alinement with the studs 19projecting from these plates. Therefore, upon the continued rotation ofthe shaft 9, the teeth 20 will engage the studs 19 of the respectivewheels and rotate said wheels. The downward movement of the raclr 22 isjust sufficient to effect one complete rotation of the shaft 9 at whichtime, the zero on the peripheral face of each wheel will appear in thesight openings. When pressure on the lever 26 is released, the spring 32immediately acts to return said lever to its normal position, and therack 22 is moved upwardly, the teeth of said raclr moving freely overthe teeth of the pinion 21 against the action of the leaf spring Thelugs 19 on the wheels l are beveled on one side and when any one ofthese wheels completes a rotation on the shaft during the operation ofthe machine, said beveled face of the lug striking against one of theteeth 20 will shift the shaft axially to its normal position. However,in ig. 9 l have shown a spring 1 1 mounted upon the inner face of theplate 14 which acts against the end of the shaft 9, so as to positivelyurge said shaft to its original position immediately upon the completionof the resetting operation.

From the foregoing description considered in connection with theaccompanying drawings, the construction, manner of operation and severaladvantages of my improved resetting mechanism for calculating machineswill be readily understood. As the operating levers are arranged at thefront of the machine case and the shaft 9 is wholly inclosed within saidcase, there are no projecting parts at the side of the case which(amstitute an obstruction to the free manipulation of the operatingcrank or handle whereby the calculating mechanism is actuated. Theresetting operation may he very quickly effected, as only a singledownward movement of the lever 26 is required. The mounting andarrangement of the several elements within the case 5 is such as tonecessitate no material alterations in the present case construction.The various parts are also of simple form and so arranged that they willnot become displaced or re quire frequent repair. I have above describedone construction and arrangement of the operating means for theresetting shaft which has been found very satisfactory in practicaloperation. It is, however, possible that other alternative lever operated means may be devised for accomplishing the same result. Thereforeit is to be understood that, while I have herein disclosed one practicaland preferred. embodiment of.the invention, the device may neverthelessbe exemplified in numerous other constructions, and I accordinglyreserve the privilege of adopting. all such legitimate changes in theform, construction and arrangement of the several elements as may befairly embodied within the spirit and sec e of the invention as claimed,

claim: 1. In a calculating machine, a rotatable and axially movableshaft, a series of digit Wheels loosely mounted on said shaft, saidwheels and the shaft having meansto coact in one position of said shaftand cause rotation of said Wheels With the shaft, andresetting means forthe digit wheels including a pinion rotatable with said shaft, a.rectilinearly movable rack coacting with said pinion when moved in onedirection to rotate the shaft, a spring yieldingly urging the rack intooperative engagement with the pinion but permitting of its movement inan opposite direction with respect thereto, inanually operable meansconnected to one end of the rack to actuate the latter, and meansoperable upon such rotation of the shaft for initially imparting alimited ax al move rnent thereto to position the coacting means on saidshaft and digit heels for operative engagement with each other 2, in acalculating machine, a rotatable and axially movable shaft, series ofdigit Wheels loosely mounted on said shaft, said wheels and the shafthaving means to coact in one position of said shaft and cause 'rotationof said wheels With the shaft, and re setting means for the digit Wheelsincluding a pinion rotatable with said shaft, a rectilinearly movablerack coacting with pinion when moved in one direction to roiate theshaft, a spring vielding the rack into operative engagerncn k1 wi h thepinion but permitting of its movement in 'n opposite direction ithereto,

. operating lever f d &

slot connection between said rack and lever, and means operable uponsuchrotation of the shaft for initially imparting a limited axialmovement thereto to position the coacting means on said shaft and digitwheels for operative engagement with each other.

3. in a calculating machine, a rotatable and axially movable shaft, aseries of digit wheels loosely mounted on said shaft, said wheels andthe shaft having means to coact in one position of said shaft and causea rotation of said wheels with the shaft, and re setting means for thedigit wheels including a'pinion rotatable with said shaft, arectilinearly movable rack coactiiig with said pinion when moved in onedirection to rotate the shaft, a spring yieldingly urging the rack intooperative engagement with the pinion but permitting of its movement inan opposite direction. with respect thereto, an operating lever for therack, a pin. and slot connection between said rack and lever, a spr'jgcoacti...gv with the lever and urging the same to its normal position,and means operable upon such rotation of the shaft for ini 'allyimparting a limited axial movement thereto to position the coactingmeans on said shaft and digit wheels for operative engagement with eachother.

in a calculating machine, two alined rotatabl y' and axially movableshafts, a series of digit wheels loosely mountedoneach of said shafts,said wheels and the corresponding shaft having means to coact in oneposition of the shaft and cause the rotation of the wheels with theshaft, a housing inclosing said digit Wheels and the shafts and havingopenings through which the digit wheels may be observed, verticallyextending slots disposed adjacent each other the adjacent ends of thetwo shafts, resetting $621118 the digit wheels including a lev actuatedmeans for rotating each shaft, said lever actuated means being disposedat the in er end of the corresponding and eaten ng' out through saidslots in the housing. and means. operable upon such ro tation or theshaft under the action of the le er "ctuated means for initiallf,imparting a ed movement; to the sl to poe coacting means on. the shaft aK; heels for operative engagement 7 ach. other (ill

